<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>localStorage</title>
</head>
<body>
<h2>localStorage</h2>
<button onclick="saveData()">点我保存一个数据</button>
<button onclick="readData()">点我读取一个数据</button>
<button onclick="deleteData()">点我删除一个数据</button>
<button onclick="deleteAllData()">点我清空一个数据</button>
<script type="text/javascript">
    let p = {name: '张三', age: 18};

    function saveData() {
        localStorage.setItem('msg', 'hello!');
        localStorage.setItem('person', JSON.stringify(p));
    }

    function readData() {
        console.log(localStorage.getItem('msg'));
        const result = localStorage.getItem('person');
        console.log(JSON.parse(result));
    }

    function deleteData() {
        // 移除
        localStorage.removeItem('msg');
    }
    function deleteAllData(){
        // 清空
        localStorage.clear();
    }
</script>
</body>
</html>
